[...]
The point of this post is to determine if there's actually a future in STO for any of my new characters.
My current Starfleet and KDF have pretty much done all there is to do, they don't do a lot except collect fleet marks now.[...]

Honestly, I don't think that you will be able to play any of those character concepts for the next two years. A Romulan faction Hirogen could happen, yes, and I'd really hope for it. But the time scale for the others is probably well beyond 2015.

I'd instead suggest you try out more things with your existing characters, like playing Foundry missions, maxing out their reputations (the existing ones and those to come) and get more crew and gear for them.